Elevator.



No. 640,859. Patented lan. 9, |900. C. M. BARTHULUMEW 8L W. F. LEDNARD.

E L E V ATO R.

(Application @led Apr. B, 1899.)

(No Model.)

'wuen low UNITED STATES PATENT OEEICE.

CASSIUS M. BARTHOLOMEW AND WILLIAM F. LEONARD, OF COLUMBUS, OHIO; SAID BARTHOLOMEW ASSIGNOR TO SAID LEONARD.

ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 640,859, dated January 9, 1900.

Application filed April 8, 1899. Serial No. 712,337. (No model.)

T Lz/ZZ whom; it may concern.-

Beit known that we, CAssIUs M. BARTHoLo- MEW and WILLIAM F. LEONARD, citizens of the United States,residing at Columbus,in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Elevators; and we do hereby declare the following to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates more particularly to means for operating the doors of elevator shafts or Wells; and it consists in improvements upon and additions to such mechanism as is illustrated in the patent of the United States granted O. M. Bartholomew September 27, 1892, No. 483,277.

On experiment we have found that the use of a coil-spring, (designated in the patent referred to as 11,) although practical, is not quite satisfactory, as uniformity and quietude of its action cannot be relied upon, and we have also found it' objectionable that the lever (designated 10 in said patent) be operated every time the car passes a door, whether opened or not. Our present improvements aim to overcome these objections.

Our invention also includes a new arrangement for holding the doors locked in their closed position until the car is about to stop without the employment of governor mechanism illustrated in said patent, which in itself, although very advantageous and practical, may in some instances be regarded as expensive.

In the accompanying drawings, Figure 1 is a'front View of an elevator Well or shaft provided with embodiments of our improvev1ments, parts being broken ont to illustrate details of construction. Fig. 2 is a detail sectional view, on larger scale, showing a door and its operating-lever and a portion of the carriage containing the cam and its operatinglever. Figs. 3 and 4 are side elevational and plan views of a door-lock that may be employedwhen the governor mechanism is dispensed with. Fig. 5 is a side view of the lever-spring and door, showing how they may be normally latched to prevent unauthorized opening.

In the drawings, 1 indicates the elevatorshaft, and 2 the car or carriage that is adapted to move in said shaft.

3, 4, and 5 designate different floors of the building.

7 denotes doors for closing the passages opening into the shaft from said iioors. The doors '7 are the usual sliding doors and are su-spended from hangers 8, adapted to slide on guideways 9 in the usual manner.

10 indicates levers, one of which is pivoted at its lower end to the side of the elevatorshaft at one side of each door 7.

11 designates a spring that is fastened in the lioor at its lower end and has its upper end normally pressing against the lever 10, tending to push the door closed. The upper end 11 (see Fig. 2) of this spring 11 is bent at an angle to its main portion and protrudes inward toward the shaft beyond the lever. The end of the spring may be provided with a roller, (not shown,) if desired.

14 designates guard or guide rails which vmay be provided to keep the spring 11 and lever 10 in proper position with respect to each other. Two forms are shown.

Attached to each door, or to the lever 10 when attached to the door, is a rope or chain 12, running over a pulley 12min the corner of the shaft, said cord or chain having a weight 12b, (see broken lines, Fig. 1,) adapted to pull the door open when the pressure of the spring 11 is taken from the lever 10. The power of the spring exceeds that of the weight, so that the door is normally closed.

15 designates a cam arranged in a suitable frame 15ab (see Fig. 2) in the front of the carriage. This cam is horizontally movable in its frame and is furnished with a pin l5", to which is attached a lever 15C, pivoted within the carriage, so that, it may be moved in or out by the operator; but in the instance now referred to a spring 151 is provided to hold the cam normally out. The cam 15 is arranged so that the end 11a of the spring lies in the path of movement of the beveled por= tion of the cam when the latter is in its protruded or normal position.

For holding the door closed until the car stops and preventing it from opening when the car continues in motion past a door We may of course employ mechanism substantially like that shown in the Bartholomew patent hereinbefore referred to; but objection has been raised in some instances to this mechanism, because of its expense.

A device for dispensing with the governor mechanism, as shown in Figs. 3 and e, consists of a horizontal rod 16, pivoted in the door-frame and having at one end a cam or inclined portion 16a to be acted on by the spring ll when moved by the cam l and a latch 16" at the other end to be thrown opposite the edge of the door and lock the same against opening when the spring l1 returns to its normal position. This latch may be provided with a spring 17, tending to hold it in its locking position.

When a separate latch` for each door, as thus desribed, is provided, it will be preferable to omit altogether the spring 15d, that holds the cam 15 normally protruded, or provide a spring that holds said cam normally in or withdrawn, so that it shall be necessary to manually project-said cam whenever it is desired to open the door, for if the cam Were normally 'protruding the latches would be Worked and the door would be opened each time vthe car passed a door, which of course would be both unnecessary and undesirable.

The upper end of the lever l0 preferably engages a notch 7':L in the door and is connected with the door by a flexible device 10a, and the cord l2 is connected with the lever, so that the lever serves as a latch to hold the door closed until the lever is pulled out of the notch by the cord 12 but the same result may be accomplished by providing a notch in the lever l0 to be engaged by the end lla of the spring. (See Fig. 5.)

l/Ve do not confine ourselves to the precise form of parts shown and described, as obviously they may be modified without departing from the scope of the invention.

What We claim, and desire to secure by Letters Patent, is

l. ln combination with an elevator-shaft and a passage-Way thereto having a sliding door, a lever 10 to act on the door, a spring 11 removably engaging said lever to press upon the same to close the door, a Weighted cord or chain attached to said door tending to open the door and a car or carriage having a cam adapted to engage the spring and take the pressure thereof from the lever when the door is to be opened.

2. In combination -With an elevator-shaft and a passage-way thereinto having a sliding door, a lever 10 to act en the door, a spring 1l removably engaging said lever to press upon the same to close the door,a weighted cord or chain attached to said door tendingl to open the door, and a car or carriage having a cam movable into or out of position to engage the spring and take the pressure thereof from the lever when the door iste be opened.

3. In combination With an elevator-shaft and a passage-Way thereinto having a sliding door, a lever l0 to act on the door, a spring ll removably engaging said lever to press upon the same to close the door, a Weighted cord or chain attached to said door tending to open the same, means whereby said door is latched by said lever, and a car or carriage having a cam adapted to engage the spring and take the pressure thereof from the 'lever when the door is to be opened. Y Y Y' 4. In combination with an elevator-'shaft and a passage-way thereinto having asliding door, a lever l0 to act on the door, a spring 1l removably engaging said lever to press upon the same to close the door, a Weighted cord or chain attached to said door tending to open the door, means whereby said door is latched by said lever, and a car or carriage having a cam movable into and out of position to engage the spring and take the pressure thereof from the lever when the door is to be opened.

5. In combination with an elevator-shaft and a passage-way thereinto having a sliding door, a lever l() to act on the door, a spring 11 removably engaging said lever to press upon the same to close the door, a weighted chain or cord attached to the door and tending 'to open the same, a car or carriage having a cam to engage the spring and take the pressure thereof from the lever and mechanism oper-V ated When the car is in motion to lock said door and permit the same to be opened when the car has stopped at the door, substantially as described.

6. In combination with an elevator-shaft and a passage-Way thereinto having a sliding door, a lever l0 to act on the door, a spring ll removably engaging said lever to press upon the same to close the doom-avveghted cord or chain attached to said door tending to open the same, means whereby said door is latched by said lever, and a car or carriage having a cam to engage the spring and take the presL sure thereof from the lever and mechanism operated when the car is in motion to locli said door and permit the same to be opened when the car has stopped and the lever 10 has' been relieved of the pressure of the spring.

7. In combination with an elevator-shaft and a passage-Way thereinto having a sliding IIS door, a lever lO to act on and latch the door but iiexibly connected therewith, a spring ll removably engaging said lever to press upon the same to close the door, a Weighted cord or chain 12 to open the door when the lever is relieved of the pressure of the spring, substantially as described.

. 8. In combination with an elevator-shaft and a passage-Way thereinto having a sliding door, a lever l0 and spring 11 to close said door, a Weighted cord or chain 12 to open said Adoor when the lever is relieved of the pressure of the spring and a latch 16 for holding 1o said door closed until after the sprin g is moved 

